Owner of skateboard company claims to do original artwork for board graphics, but I feel it's mostly others work that has been traced or altered. I need help identifying the original artists and their work that has been used.

It seems whenever somone calls him out on using others work they instantly have their comment removed/blocked, but most of the artwork in question is posted here.http://ift.tt/1Nmz83u http://ift.tt/1Nmz83w